There are over twenty devices that now support screen casting, including most Nexus devices from the Nexus 10 and later, several Galaxy flagship devices from the S4 and later, the HTC One M7 (but not the HTC One M8), the LG G2, G Pro 2 and G3, the Sony Z2 and Z3 range. Unusually, none of the Moto devices are supported, so as at now if you have the Moto G or Moto X from 2013 or 2014, you’re out of luck. However, we know that Google are adding more devices all of the time so hopefully these devices are in the “coming soon” bracket.